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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.primitives;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkElementIndex;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import static com.google.common.base.Preconditions.checkPositionIndexes;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import com.google.common.annotations.Beta;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import com.google.common.annotations.GwtCompatible;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import com.google.common.annotations.GwtIncompatible;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.io.Serializable;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.AbstractList;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.Arrays;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.Collection;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.Collections;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.Comparator;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.util.List;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.util.RandomAccess;<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>import javax.annotation.CheckForNull;<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>/**<a name="line.39"></a>
<span class="sourceLineNo">040</span> * Static utility methods pertaining to {@code int} primitives, that are not<a name="line.40"></a>
<span class="sourceLineNo">041</span> * already found in either {@link Integer} or {@link Arrays}.<a name="line.41"></a>
<span class="sourceLineNo">042</span> *<a name="line.42"></a>
<span class="sourceLineNo">043</span> * &lt;p&gt;See the Guava User Guide article on &lt;a href=<a name="line.43"></a>
<span class="sourceLineNo">044</span> * "http://code.google.com/p/guava-libraries/wiki/PrimitivesExplained"&gt;<a name="line.44"></a>
<span class="sourceLineNo">045</span> * primitive utilities&lt;/a&gt;.<a name="line.45"></a>
<span class="sourceLineNo">046</span> *<a name="line.46"></a>
<span class="sourceLineNo">047</span> * @author Kevin Bourrillion<a name="line.47"></a>
<span class="sourceLineNo">048</span> * @since 1.0<a name="line.48"></a>
<span class="sourceLineNo">049</span> */<a name="line.49"></a>
<span class="sourceLineNo">050</span>@GwtCompatible(emulated = true)<a name="line.50"></a>
<span class="sourceLineNo">051</span>public final class Ints {<a name="line.51"></a>
<span class="sourceLineNo">052</span>  private Ints() {}<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>  /**<a name="line.54"></a>
<span class="sourceLineNo">055</span>   * The number of bytes required to represent a primitive {@code int}<a name="line.55"></a>
<span class="sourceLineNo">056</span>   * value.<a name="line.56"></a>
<span class="sourceLineNo">057</span>   */<a name="line.57"></a>
<span class="sourceLineNo">058</span>  public static final int BYTES = Integer.SIZE / Byte.SIZE;<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>  /**<a name="line.60"></a>
<span class="sourceLineNo">061</span>   * The largest power of two that can be represented as an {@code int}.<a name="line.61"></a>
<span class="sourceLineNo">062</span>   *<a name="line.62"></a>
<span class="sourceLineNo">063</span>   * @since 10.0<a name="line.63"></a>
<span class="sourceLineNo">064</span>   */<a name="line.64"></a>
<span class="sourceLineNo">065</span>  public static final int MAX_POWER_OF_TWO = 1 &lt;&lt; (Integer.SIZE - 2);<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>  /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>   * Returns a hash code for {@code value}; equal to the result of invoking<a name="line.68"></a>
<span class="sourceLineNo">069</span>   * {@code ((Integer) value).hashCode()}.<a name="line.69"></a>
<span class="sourceLineNo">070</span>   *<a name="line.70"></a>
<span class="sourceLineNo">071</span>   * @param value a primitive {@code int} value<a name="line.71"></a>
<span class="sourceLineNo">072</span>   * @return a hash code for the value<a name="line.72"></a>
<span class="sourceLineNo">073</span>   */<a name="line.73"></a>
<span class="sourceLineNo">074</span>  public static int hashCode(int value) {<a name="line.74"></a>
<span class="sourceLineNo">075</span>    return value;<a name="line.75"></a>
<span class="sourceLineNo">076</span>  }<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>  /**<a name="line.78"></a>
<span class="sourceLineNo">079</span>   * Returns the {@code int} value that is equal to {@code value}, if possible.<a name="line.79"></a>
<span class="sourceLineNo">080</span>   *<a name="line.80"></a>
<span class="sourceLineNo">081</span>   * @param value any value in the range of the {@code int} type<a name="line.81"></a>
<span class="sourceLineNo">082</span>   * @return the {@code int} value that equals {@code value}<a name="line.82"></a>
<span class="sourceLineNo">083</span>   * @throws IllegalArgumentException if {@code value} is greater than {@link<a name="line.83"></a>
<span class="sourceLineNo">084</span>   *     Integer#MAX_VALUE} or less than {@link Integer#MIN_VALUE}<a name="line.84"></a>
<span class="sourceLineNo">085</span>   */<a name="line.85"></a>
<span class="sourceLineNo">086</span>  public static int checkedCast(long value) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>    int result = (int) value;<a name="line.87"></a>
<span class="sourceLineNo">088</span>    checkArgument(result == value, "Out of range: %s", value);<a name="line.88"></a>
<span class="sourceLineNo">089</span>    return result;<a name="line.89"></a>
<span class="sourceLineNo">090</span>  }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>  /**<a name="line.92"></a>
<span class="sourceLineNo">093</span>   * Returns the {@code int} nearest in value to {@code value}.<a name="line.93"></a>
<span class="sourceLineNo">094</span>   *<a name="line.94"></a>
<span class="sourceLineNo">095</span>   * @param value any {@code long} value<a name="line.95"></a>
<span class="sourceLineNo">096</span>   * @return the same value cast to {@code int} if it is in the range of the<a name="line.96"></a>
<span class="sourceLineNo">097</span>   *     {@code int} type, {@link Integer#MAX_VALUE} if it is too large,<a name="line.97"></a>
<span class="sourceLineNo">098</span>   *     or {@link Integer#MIN_VALUE} if it is too small<a name="line.98"></a>
<span class="sourceLineNo">099</span>   */<a name="line.99"></a>
<span class="sourceLineNo">100</span>  public static int saturatedCast(long value) {<a name="line.100"></a>
<span class="sourceLineNo">101</span>    if (value &gt; Integer.MAX_VALUE) {<a name="line.101"></a>
<span class="sourceLineNo">102</span>      return Integer.MAX_VALUE;<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span>    if (value &lt; Integer.MIN_VALUE) {<a name="line.104"></a>
<span class="sourceLineNo">105</span>      return Integer.MIN_VALUE;<a name="line.105"></a>
<span class="sourceLineNo">106</span>    }<a name="line.106"></a>
<span class="sourceLineNo">107</span>    return (int) value;<a name="line.107"></a>
<span class="sourceLineNo">108</span>  }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>  /**<a name="line.110"></a>
<span class="sourceLineNo">111</span>   * Compares the two specified {@code int} values. The sign of the value<a name="line.111"></a>
<span class="sourceLineNo">112</span>   * returned is the same as that of {@code ((Integer) a).compareTo(b)}.<a name="line.112"></a>
<span class="sourceLineNo">113</span>   *<a name="line.113"></a>
<span class="sourceLineNo">114</span>   * @param a the first {@code int} to compare<a name="line.114"></a>
<span class="sourceLineNo">115</span>   * @param b the second {@code int} to compare<a name="line.115"></a>
<span class="sourceLineNo">116</span>   * @return a negative value if {@code a} is less than {@code b}; a positive<a name="line.116"></a>
<span class="sourceLineNo">117</span>   *     value if {@code a} is greater than {@code b}; or zero if they are equal<a name="line.117"></a>
<span class="sourceLineNo">118</span>   */<a name="line.118"></a>
<span class="sourceLineNo">119</span>  public static int compare(int a, int b) {<a name="line.119"></a>
<span class="sourceLineNo">120</span>    return (a &lt; b) ? -1 : ((a &gt; b) ? 1 : 0);<a name="line.120"></a>
<span class="sourceLineNo">121</span>  }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>  /**<a name="line.123"></a>
<span class="sourceLineNo">124</span>   * Returns {@code true} if {@code target} is present as an element anywhere in<a name="line.124"></a>
<span class="sourceLineNo">125</span>   * {@code array}.<a name="line.125"></a>
<span class="sourceLineNo">126</span>   *<a name="line.126"></a>
<span class="sourceLineNo">127</span>   * @param array an array of {@code int} values, possibly empty<a name="line.127"></a>
<span class="sourceLineNo">128</span>   * @param target a primitive {@code int} value<a name="line.128"></a>
<span class="sourceLineNo">129</span>   * @return {@code true} if {@code array[i] == target} for some value of {@code<a name="line.129"></a>
<span class="sourceLineNo">130</span>   *     i}<a name="line.130"></a>
<span class="sourceLineNo">131</span>   */<a name="line.131"></a>
<span class="sourceLineNo">132</span>  public static boolean contains(int[] array, int target) {<a name="line.132"></a>
<span class="sourceLineNo">133</span>    for (int value : array) {<a name="line.133"></a>
<span class="sourceLineNo">134</span>      if (value == target) {<a name="line.134"></a>
<span class="sourceLineNo">135</span>        return true;<a name="line.135"></a>
<span class="sourceLineNo">136</span>      }<a name="line.136"></a>
<span class="sourceLineNo">137</span>    }<a name="line.137"></a>
<span class="sourceLineNo">138</span>    return false;<a name="line.138"></a>
<span class="sourceLineNo">139</span>  }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span>  /**<a name="line.141"></a>
<span class="sourceLineNo">142</span>   * Returns the index of the first appearance of the value {@code target} in<a name="line.142"></a>
<span class="sourceLineNo">143</span>   * {@code array}.<a name="line.143"></a>
<span class="sourceLineNo">144</span>   *<a name="line.144"></a>
<span class="sourceLineNo">145</span>   * @param array an array of {@code int} values, possibly empty<a name="line.145"></a>
<span class="sourceLineNo">146</span>   * @param target a primitive {@code int} value<a name="line.146"></a>
<span class="sourceLineNo">147</span>   * @return the least index {@code i} for which {@code array[i] == target}, or<a name="line.147"></a>
<span class="sourceLineNo">148</span>   *     {@code -1} if no such index exists.<a name="line.148"></a>
<span class="sourceLineNo">149</span>   */<a name="line.149"></a>
<span class="sourceLineNo">150</span>  public static int indexOf(int[] array, int target) {<a name="line.150"></a>
<span class="sourceLineNo">151</span>    return indexOf(array, target, 0, array.length);<a name="line.151"></a>
<span class="sourceLineNo">152</span>  }<a name="line.152"></a>
<span class="sourceLineNo">153</span><a name="line.153"></a>
<span class="sourceLineNo">154</span>  // TODO(kevinb): consider making this public<a name="line.154"></a>
<span class="sourceLineNo">155</span>  private static int indexOf(<a name="line.155"></a>
<span class="sourceLineNo">156</span>      int[] array, int target, int start, int end) {<a name="line.156"></a>
<span class="sourceLineNo">157</span>    for (int i = start; i &lt; end; i++) {<a name="line.157"></a>
<span class="sourceLineNo">158</span>      if (array[i] == target) {<a name="line.158"></a>
<span class="sourceLineNo">159</span>        return i;<a name="line.159"></a>
<span class="sourceLineNo">160</span>      }<a name="line.160"></a>
<span class="sourceLineNo">161</span>    }<a name="line.161"></a>
<span class="sourceLineNo">162</span>    return -1;<a name="line.162"></a>
<span class="sourceLineNo">163</span>  }<a name="line.163"></a>
<span class="sourceLineNo">164</span><a name="line.164"></a>
<span class="sourceLineNo">165</span>  /**<a name="line.165"></a>
<span class="sourceLineNo">166</span>   * Returns the start position of the first occurrence of the specified {@code<a name="line.166"></a>
<span class="sourceLineNo">167</span>   * target} within {@code array}, or {@code -1} if there is no such occurrence.<a name="line.167"></a>
<span class="sourceLineNo">168</span>   *<a name="line.168"></a>
<span class="sourceLineNo">169</span>   * &lt;p&gt;More formally, returns the lowest index {@code i} such that {@code<a name="line.169"></a>
<span class="sourceLineNo">170</span>   * java.util.Arrays.copyOfRange(array, i, i + target.length)} contains exactly<a name="line.170"></a>
<span class="sourceLineNo">171</span>   * the same elements as {@code target}.<a name="line.171"></a>
<span class="sourceLineNo">172</span>   *<a name="line.172"></a>
<span class="sourceLineNo">173</span>   * @param array the array to search for the sequence {@code target}<a name="line.173"></a>
<span class="sourceLineNo">174</span>   * @param target the array to search for as a sub-sequence of {@code array}<a name="line.174"></a>
<span class="sourceLineNo">175</span>   */<a name="line.175"></a>
<span class="sourceLineNo">176</span>  public static int indexOf(int[] array, int[] target) {<a name="line.176"></a>
<span class="sourceLineNo">177</span>    checkNotNull(array, "array");<a name="line.177"></a>
<span class="sourceLineNo">178</span>    checkNotNull(target, "target");<a name="line.178"></a>
<span class="sourceLineNo">179</span>    if (target.length == 0) {<a name="line.179"></a>
<span class="sourceLineNo">180</span>      return 0;<a name="line.180"></a>
<span class="sourceLineNo">181</span>    }<a name="line.181"></a>
<span class="sourceLineNo">182</span><a name="line.182"></a>
<span class="sourceLineNo">183</span>    outer:<a name="line.183"></a>
<span class="sourceLineNo">184</span>    for (int i = 0; i &lt; array.length - target.length + 1; i++) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>      for (int j = 0; j &lt; target.length; j++) {<a name="line.185"></a>
<span class="sourceLineNo">186</span>        if (array[i + j] != target[j]) {<a name="line.186"></a>
<span class="sourceLineNo">187</span>          continue outer;<a name="line.187"></a>
<span class="sourceLineNo">188</span>        }<a name="line.188"></a>
<span class="sourceLineNo">189</span>      }<a name="line.189"></a>
<span class="sourceLineNo">190</span>      return i;<a name="line.190"></a>
<span class="sourceLineNo">191</span>    }<a name="line.191"></a>
<span class="sourceLineNo">192</span>    return -1;<a name="line.192"></a>
<span class="sourceLineNo">193</span>  }<a name="line.193"></a>
<span class="sourceLineNo">194</span><a name="line.194"></a>
<span class="sourceLineNo">195</span>  /**<a name="line.195"></a>
<span class="sourceLineNo">196</span>   * Returns the index of the last appearance of the value {@code target} in<a name="line.196"></a>
<span class="sourceLineNo">197</span>   * {@code array}.<a name="line.197"></a>
<span class="sourceLineNo">198</span>   *<a name="line.198"></a>
<span class="sourceLineNo">199</span>   * @param array an array of {@code int} values, possibly empty<a name="line.199"></a>
<span class="sourceLineNo">200</span>   * @param target a primitive {@code int} value<a name="line.200"></a>
<span class="sourceLineNo">201</span>   * @return the greatest index {@code i} for which {@code array[i] == target},<a name="line.201"></a>
<span class="sourceLineNo">202</span>   *     or {@code -1} if no such index exists.<a name="line.202"></a>
<span class="sourceLineNo">203</span>   */<a name="line.203"></a>
<span class="sourceLineNo">204</span>  public static int lastIndexOf(int[] array, int target) {<a name="line.204"></a>
<span class="sourceLineNo">205</span>    return lastIndexOf(array, target, 0, array.length);<a name="line.205"></a>
<span class="sourceLineNo">206</span>  }<a name="line.206"></a>
<span class="sourceLineNo">207</span><a name="line.207"></a>
<span class="sourceLineNo">208</span>  // TODO(kevinb): consider making this public<a name="line.208"></a>
<span class="sourceLineNo">209</span>  private static int lastIndexOf(<a name="line.209"></a>
<span class="sourceLineNo">210</span>      int[] array, int target, int start, int end) {<a name="line.210"></a>
<span class="sourceLineNo">211</span>    for (int i = end - 1; i &gt;= start; i--) {<a name="line.211"></a>
<span class="sourceLineNo">212</span>      if (array[i] == target) {<a name="line.212"></a>
<span class="sourceLineNo">213</span>        return i;<a name="line.213"></a>
<span class="sourceLineNo">214</span>      }<a name="line.214"></a>
<span class="sourceLineNo">215</span>    }<a name="line.215"></a>
<span class="sourceLineNo">216</span>    return -1;<a name="line.216"></a>
<span class="sourceLineNo">217</span>  }<a name="line.217"></a>
<span class="sourceLineNo">218</span><a name="line.218"></a>
<span class="sourceLineNo">219</span>  /**<a name="line.219"></a>
<span class="sourceLineNo">220</span>   * Returns the least value present in {@code array}.<a name="line.220"></a>
<span class="sourceLineNo">221</span>   *<a name="line.221"></a>
<span class="sourceLineNo">222</span>   * @param array a &lt;i&gt;nonempty&lt;/i&gt; array of {@code int} values<a name="line.222"></a>
<span class="sourceLineNo">223</span>   * @return the value present in {@code array} that is less than or equal to<a name="line.223"></a>
<span class="sourceLineNo">224</span>   *     every other value in the array<a name="line.224"></a>
<span class="sourceLineNo">225</span>   * @throws IllegalArgumentException if {@code array} is empty<a name="line.225"></a>
<span class="sourceLineNo">226</span>   */<a name="line.226"></a>
<span class="sourceLineNo">227</span>  public static int min(int... array) {<a name="line.227"></a>
<span class="sourceLineNo">228</span>    checkArgument(array.length &gt; 0);<a name="line.228"></a>
<span class="sourceLineNo">229</span>    int min = array[0];<a name="line.229"></a>
<span class="sourceLineNo">230</span>    for (int i = 1; i &lt; array.length; i++) {<a name="line.230"></a>
<span class="sourceLineNo">231</span>      if (array[i] &lt; min) {<a name="line.231"></a>
<span class="sourceLineNo">232</span>        min = array[i];<a name="line.232"></a>
<span class="sourceLineNo">233</span>      }<a name="line.233"></a>
<span class="sourceLineNo">234</span>    }<a name="line.234"></a>
<span class="sourceLineNo">235</span>    return min;<a name="line.235"></a>
<span class="sourceLineNo">236</span>  }<a name="line.236"></a>
<span class="sourceLineNo">237</span><a name="line.237"></a>
<span class="sourceLineNo">238</span>  /**<a name="line.238"></a>
<span class="sourceLineNo">239</span>   * Returns the greatest value present in {@code array}.<a name="line.239"></a>
<span class="sourceLineNo">240</span>   *<a name="line.240"></a>
<span class="sourceLineNo">241</span>   * @param array a &lt;i&gt;nonempty&lt;/i&gt; array of {@code int} values<a name="line.241"></a>
<span class="sourceLineNo">242</span>   * @return the value present in {@code array} that is greater than or equal to<a name="line.242"></a>
<span class="sourceLineNo">243</span>   *     every other value in the array<a name="line.243"></a>
<span class="sourceLineNo">244</span>   * @throws IllegalArgumentException if {@code array} is empty<a name="line.244"></a>
<span class="sourceLineNo">245</span>   */<a name="line.245"></a>
<span class="sourceLineNo">246</span>  public static int max(int... array) {<a name="line.246"></a>
<span class="sourceLineNo">247</span>    checkArgument(array.length &gt; 0);<a name="line.247"></a>
<span class="sourceLineNo">248</span>    int max = array[0];<a name="line.248"></a>
<span class="sourceLineNo">249</span>    for (int i = 1; i &lt; array.length; i++) {<a name="line.249"></a>
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</pre>
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